Fix awk not found while importing pcap on Windows

For non-Windows platforms, the default paths for awk, diff, gzip are
fixed at compile time since these are standard utilities for these
platforms. However, for Windows, we ship these utilities along with
Ostinato, so we need to set default path as the application directory
which is known only at run time. This is done as part of
Preferences::initDefaults() and therefore should be called before
setting OstProtoLib external program paths

client/main.cpp

@@ -65,6 +65,8 @@ int main(int argc, char* argv[])
     OstProtocolManager = new ProtocolManager();
     OstProtocolWidgetFactory = new ProtocolWidgetFactory();
 
+    Preferences::initDefaults();
+
     /* (Portable Mode) If we have a .ini file in the same directory as the 
        executable, we use that instead of the platform specific location
        and format for the settings */
@@ -81,7 +83,6 @@ int main(int argc, char* argv[])
         appSettings->value(kDiffPathKey, kDiffPathDefaultValue).toString(),
         appSettings->value(kAwkPathKey, kAwkPathDefaultValue).toString());
 
-    Preferences::initDefaults();
     qsrand(QDateTime::currentDateTime().toTime_t());
 
     mainWindow = new MainWindow;